Have your friend read the toparion and Kontakion to the Saint. They usually tell us several things:
1) the story of the Saint and why he or she is a saint.
2) The presence of the Saint in Heaven
3) The role as a fellow intercessor or prayer partner asking Christ Our Lord to save us.
Here is the Troparion and Kontakion of St Vladimir Equal to the Apostles observed today his feasts day from the OCA website www.oca.org
Troparion - Tone 4
Holy Prince Vladimir,
you were like a merchant in search of fine pearls.
By sending servants to Constantinople for the Orthodox Faith, you found Christ, the priceless pearl.
He appointed you to be another Paul,
washing away in baptism your physical and spiritual blindness.
We celebrate your memory,
asking you to pray for all Orthodox Christians and for us, your spiritual children.
Kontakion - Tone 8
Most glorious Vladimir, in your old age you imitated the great apostle Paul:
he abandoned childish things, while you forsook the idolatry of your youth.
Together with him you reached the fullness of divine wisdom:
You were adorned with the purity of holy baptism.
Now as you stand before Christ our Savior, pray that all Orthodox Christians may be saved.